Whapfloopleshiz
The sound of someone being smacked (whap); collapsing to the ground (floople); having the coprophagous grin wiped from their face (shiz)
Eternalfool smacked the irritating yogurt chick with all the vigor she could muster, and all the ferocity that yogurt chick deserved. "Whapfloopleshiz!" filled the room.